精铸件收缩率分布规律研究进展  

Research Development on Shrinkage Fraction Distribution of Investment Castings

作　　者：卜昆[1] 张雅莉 于茜[1] 邱飞[1] 田国良[1] BU Kun;ZHANG Yali;YU Qian;QIU Fei;TIAN Guoliang(Laboratory of Aero-Engine High Performance Manufacturing,Northwestern Polytechnical University,Xi’an 710072,China)

机构地区：[1]西北工业大学航空发动机高性能制造实验室

出　　处：《航空制造技术》2019年第20期37-44,共8页Aeronautical Manufacturing Technology

摘　　要：空心涡轮叶片作为航空发动机的关键热端部件,通常采用近净形熔模精密铸造工艺制成,其成型质量偏低、废品率极高。首先介绍了熔模精密铸造技术在精确控形方面的研究现状,分析发现,在模具设计时收缩率赋值的准确与否直接影响精铸件的尺寸精度。然后概述了精铸件凝固过程收缩率的各影响因素,重点分析了收缩率的结构相关性研究进展。最后,总结了空心涡轮叶片等精铸件的收缩率分布规律研究成果。As the key hot end component of aero-engine, hollow turbine blades are usually made by near-net shape investment casting process, which has low molding quality and high rejection rate. Firstly, the research status of investment precision casting technology in "precise shape control" was introduced. It was found that the accuracy of shrinkage fraction assignment in mold design directly affects the dimensional accuracy of precision castings. Then, the influencing factors of casting shrinkage fraction during solidification process were summarized, and the research process of structural correlation of shrinkage fraction was analyzed emphatically. Finally, the research results of shrinkage fraction distribution of precision castings such as hollow turbine blades were summarized.

关 键 词：熔模精密铸造 尺寸精度 精确控形 收缩率 结构 

分 类 号：TG2[金属学及工艺—铸造]